以鋼索補強之牙桿懸吊管線系統耐震補強研究

A Study on Cable Restrained Seismic Behavior of Suspended Piping Systems with Rod Support

台灣在公共工程、醫院等建築物中，經常以螺紋牙桿為懸吊構件，支撐裝載水系的單桿管線或共同吊架，例如：懸吊式消防撒水系統、懸吊式共同管線吊架系統等。然而，多數的懸吊設備不會額外顧及受震振動問題，僅考慮自重支撐是否足夠，因此該類型以螺紋牙桿為懸吊構件的設備，經常在地震中震動過大損壞、漏水，造成使用空間既有機能停擺、增加維修成本。本研究針對國內常見螺紋牙桿之消防撒水系統與共同管線吊架系統，及其常用之施工與補強方式，參考NFPA13與ISAT之補強建議下，利用經UL認證市售鋼索補強，進行振動台實驗，分析比較補強前後系統識別、動靜態特性差異。實驗顯示利用鋼索補強可以大量降低地震造成的管線振動量，確認該補強構件為實務亦可使用之耐震補強策略。

In Taiwan, rod supports are usually used for suspension systems in hospitals and public spaces, such as fire-sprinkler piping systems and trapeze systems. Because pipe breakage and leakage after an earthquake can reduce the building function and cost lots of money and time to recover, the dynamic behavior of the above systems is important to understand before a good retrofit program is proposed. This study focuses on the rod support for suspended fire-protection sprinkler piping systems and suspended trapeze system. Retrofitted with cables that satisfied the seismic component requirements from NFPA13 and ISAT, and the cable restraint components which were certified by UL, we studied their dynamic behavior. By shaking table tests, the system identification and system characteristic were analyzed for before and after retrofit. Test results indicated that cables are effective to reduce the horizontal displacement of rod supported piping and trapeze systems in earthquake motion.